جستجوی مقالات مرتبط با کلیدواژه "impact resistance" در نشریات گروه "مواد و متالورژی"

Impact resistance and energy absorption of thermosetting composites not only due to the inherence brittleness of the matrix, but also reinforcing the matrix with other composite components due to agglomerated phases, weak interfacial interaction at the absence of functionalization and coupling agents and thus weak interfacial load transfer could result in more deteriorated thermosetting composites energy absorption behavior. One important geometrical quantity is the effective aspect ratio (AR) of fillers. In this study, hybrid microcomposites of natural kenaf fiber/polyester was prepared through a direct mixing technique using nominal fibers ARs of 160, 250 and 320. To evaluate the synergistic effects, micro-particles of carbon black (CB) at the loading of 0 to 8 wt% were added to specimens with kenaf wt% of 5. The results demonstrated the direct influence of AR and wt% of fibers on the impact resistance with up to 203% improvement. The synergistic effect of CBs on the reference sample containing 5 wt% of fibers of 0.5 and 1 cm and 5 wt% led to 108% increase in the impact resistance in the case of 0.5 cm long fibers; however, at longer fibers the addition of CB resulted in the decrease in impact resistance and no significant changes in absorbed energy. The observed 28 and 65% enhancement in the absorbed energy of behavior of samples filled 5wt% of CB and 5 wt% of kenaf with the length of 0.5 cm compared to neat polyester and the reference kenaf/polyester parts, respectively, confirmed the synergistic effect of CBs and kenaf.